Island



F. OLDS Grinding Mill.

Patented Dec. 29, 1857.

N. PETERS Plwwulho n hen Washington. 0. c.

UNITED STATES PATENT OFFICE.

FRANKLIN OLDS, OF PROVIDENCE, RHODE ISLAND.

GRINDING-MILL.

Specification of Letters Patent No. 18,985, dated December 29, 1857.

To all whom it may concern:

Be it known that I, FRANKLIN OLDS, of Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Grinding-Mills; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure 1 is a vertical section of my improvement. Fig. 2 is a section showing the means employed for securing the screw rods or preventing them from turning.

This invention consists of a new article of manufacture, viz. a grinding mill, made substantially as hereinafter described.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A represents a cast iron curb or casing of cylindrical form and supported by a framing B arranged in any proper manner. The curb or casing A is formed of two parts (a), (6), connected together by screw bolts (0), which pass through ears or vertical tubular projections at the outer side of the curb.

To the center of the base C of the framing B, a nut D is attached, and a screw E is fitted in said nut. The screw E has a hand wheel F on its upper part, and a step Gr rests upon the upper end of the screw. The step G is of cylindrical form and is fitted in a socket H, which is at the upper part of a bowshaped support I attached to the base. The step G is allowed to work up and down in the socket H, but is prevented from turning therein by a screw (0), the end of which fits in a vertical groove in the step. The upper end of the step also has a shoulder (f) formed on it to prevent its descending below a certain distance within the socket.

J represents a spindle, the lower end of which is fitted in the step G. This spindle passes up through the center of the curb A and projects a short distance above its upper surface.

K represents the lower stone or runner which is attached to the spindle J. The stone K is placed in the lower part (b) of the curb.

L is the upper or stationary stone which i is secured within the upper part (a) of the curb. The stone L, has an iron band (g) around its upper end, and projecting bars (h) are attached to said band. Through the projecting bars (it) screw rods pass, the rods passing through the top plate of the curb A. The upper ends of the screw rods (2') have squares formed on them to receive a wrench, and a flanch (j) is also formed on each rod just below the square. The upper surfaces of the fianches (j) are of conical form, and a plate (7a) is fitted over each fianch, said plates having a screw bolt (Z) passing through each end and into the top of the curb A. The plates (is) are employed to prevent the casual turning of the screw rods which is effected by screwing the plates (is) down so that they will bear with a requisite degree of pressure on the conical flanches (j), see more particularly Fig. 2. Four screw rods may be employed.

The upper end of the spindle J has a square (m) formed on it, and a sleeve is fitted on said square. The lower end of a square shaft (0) is fitted within the upper part of the sleeve (7), and the upper end of the shaft (0) is fitted within a sleeve (p) which is also fitted on the lower end of a vertical shaft M which is fitted in a proper framing. The sleeve is retained on the ends of the two shafts M, (0) by a pin (g) which passes transversely through the shaft (0). The shaft M is the driving shaft, and a pulley N is placed thereon.

O is the hopper and P is a shoe placed below it, said shoe conducting the grain to the orifice through the center of the upper stone L. A damsel Q is placed on the upper part of the spindle J, said damsel giving the shake motion to the shoe.

From the above description of parts it will be seen that the spindle J will not be subjected to any lateral pressure and consequently much friction is avoided thereby. In the usual mills the spindle is driven directly from shafting either by belts or gearing, and the spindle is consequently subjected to a lateral pressure and much friction is created in the bearings of the spindle. In my improvement, the power or driving shaft being connected to the spindle by means of the shaft (0) the rotary motion is communicated to the spindle but not the lateral pressure.

The parallelism of the two stones may be preserved with the greatest facility, the adjustment of the screw rods (i) being only required. This is an important feature of the invention for good work cannot be done unless the stones are parallel.

The lower stone may be raised and lowered so that the stones may grind finer or coarser by merely turning the hand Wheel F, and as the step G is raised and lowered in a vertical line, the stone K will be raised and lowered in a perfectly vertical position. In the usual or old mills the spindles Were stepped in bridge trees or levers which were raised and lowered at one end. By this means the spindles were thrown out of line at every adjustment of the stones. This difficulty has been partially obviated .by having the steps of the spindles set in swivels or universal joints but these devices are not generally used, on account of their complexity, and liability to get out of repair and the expense attending their construction.

herein set forth.

FRANKLIN OLDS. Witnesses: I

ALBERT R. BRIGGS, S. B. JoHNsoN. 

